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Facebook this morning filed with the SEC to expand the size of its initial public offering by 83.8 million shares. All of the additional shares will be sold by insiders, with no expansion of the number to be sold by the company. Facebook is now planning to sell 421,233,615 shares, including 180 million from the company and 241,233,615 from selling holders. The company maintained the expected price range for the deal at $34-$38 a share.

The expanded deal would raise $16 billion at the top of the price range

The size of the "green shoe" over-allotment option was increased to 63,185,042 shares from 50,612,302 shares. Were that exercised, the total value of the deal at the top of the range would be $18.4 billion.

A variety of insiders are now planning to sell more shares:

Tiger Global upped the number of shares it will sell to 23.4 million, from 3.4 million.

Mail.ru upped its planned sale to 19.6 million from 11.3 million.

Accel Partners now plans to sell 49 million shares, up from 38.2 million.

DST Group will sell 45.7 million shares, up from 26.3 million.

Goldman Sachs will sell 28.7 million shares, up from 13.2 million.

Greylock will sell 7.6 million shares, up from 7 million.

Peter Thiel will sell 16.8 million shares, up from 7.7 million.

The company is expected to price the offering after the close on Thursday, with trading to commence Friday morning.